The authors extend the coset space formulation of the one-field realization of w1+ infinity to include more fields as the coset parameters. This can be done either by choosing a smaller stability subalgebra in the non-linear realization of w1+ infinity symmetry, or by considering a non-linear realization of some extended symmetry, or by combining both options. They show that all these possibilities give rise to the multi-field realizations or w1+ infinity . They deduce the two-field realization of w1+ infinity , proceeding from a coset space of the symmetry group G which is an extension of w1+ infinity , by the second self-commuting set of higher spin currents. Next, starting with the unextended w1+ infinity , but placing all its spin-2 generators into the coset, they obtain a new two-field realization of w1+ infinity , which essentially involves a 2D dilaton. In order to construct the invariant action for this system they add one more field and so get a new three-field realization of w1+ infinity . They re-derive it within the coset space approach, by applying the latter to an extended symmetry group G which is a non-linear deformation of G. Finally they present some multi-field generalizations of their three-field realization and discuss several intriguing parallels with N=2 strings and conformal affine Toda theories.